One of the factors that determines the ? of a capacitor is the frequency measured in hertz.

The reactance of the capacitor

Explanation:

In an AC circuit containing different elements (capacitors, resistors and inductors), we cannot simply calculate the equivalent resistance of the circuit, so another quantity is used, which is called reactance.

For a capacitor, the reactance is given by:

where:

f is the frequency of the AC current in the circuit

C is the capacitance of the capacitor

The reactance has a similar meaning to that of the resistance for a DC current. In fact, we notice that:

- When f=0 (which means we are in regime of DC current, because the current never changes direction), the reactance is infinite. This is correct: in a DC circuit, the capacitor does not let current pass through it, so it like it has infinite resistance (=infinite reactance)

- When f tends to infinite, the reactance becomes zero: in such situation, the current in the circuit changes direction so quickly that the capacitor has no enough time to "block" the current in the circuit, so it like it has almost zero resistance (zero reactance).

Explanation:

Capacitive reactance is  the opposition offered to the passage of alternating current.

The capacitive reactance is defined as

Where is the capacitive reactance in ohms, is the AC frequency in hertz and is the capacitance in microfarads.

This mathematical definition stablish a relation between capactivie reactance and frequency, actually these two are inversely proportional, that is, more frequency means less capacitive reactance.

Therefore, the word that completes the statement is reactance.

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